<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<p>123</p>
		<div id="box">
			456
		</div>
		<div class="box">
			789
		</div>
	</body>
</html>
<script src="4选择器插件.js" type="text/javascript" charset="utf-8"></script>
<script>
	console.log(Select.$(".box").innerHTML);
	console.log(Select.$("#box").innerHTML);
	console.log(Select.$("p").innerHTML);
</script>